221242404242123 has 16 divisors (see below), whose sum is σ = 241518930266880. Its totient is φ = 200993179884000.

The previous prime is 221242404242117. The next prime is 221242404242141. The reversal of 221242404242123 is 321242404242122.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221242404242123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221242404242143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115001813 + ... + 116909801.

It is an arithmetic number, because the mean of its divisors is an integer number (15094933141680).

Almost surely, 2^{221242404242123} is an apocalyptic number.

221242404242123 is a deficient number, since it is larger than the sum of its proper divisors (20276526024757).

221242404242123 is a wasteful number, since it uses less digits than its factorization.

221242404242123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1915138.

The product of its (nonzero) digits is 98304, while the sum is 35.

Adding to 221242404242123 its reverse (321242404242122), we get a palindrome (542484808484245).

Subtracting 221242404242123 from its reverse (321242404242122), we obtain a palindrome (99999999999999).

The spelling of 221242404242123 in words is "two hundred twenty-one trillion, two hundred forty-two billion, four hundred four million, two hundred forty-two thousand, one hundred twenty-three".